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In situ estimation of ephyrae liberated from polyps of Aurelia aurita using settling plates in Tokyo Bay, Japan

  • Conference paper
Jellyfish Blooms: Ecological and Societal Importance

Part of the book series: Developments in Hydrobiology ((DIHY,volume 155))

Abstract

The continuous changes in the number of newly established polyps of Aurelia aurita (L.) on settling plates under natural conditions were observed from August 1998 to September 1999 in Tokyo Bay, Japan. A sharp decline in survivorship of newly settled polyps was observed within the first few days, however, survivorship of polyps settled in October increased by budding up to 399% after two months. The number of discs in each strobila varied from 1 to 6, however, most of the strobilae formed single discs. The percentage ratios of the total number of ephyrae to the initial number of polyps on settling plates were generally lower than 10%, but the highest ratio of 594.4% was estimated for the polyps settled in October. It is considered that most of the liberated ephyrae originate from the polyps settled in October in Tokyo Bay. This study suggests that the occurrence of ripe medusae with planula larvae throughout the year contributes to the success of settlement and growth of the polyp stage in Tokyo Bay.

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Authors and Affiliations

  1. Tokyo University of Fisheries, 4-5-7 Konan Minato-ku, Tokyo, 108-8477, Japan

    Tomoko Watanabe & Haruto Ishii

Authors
  1. Tomoko Watanabe
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  2. Haruto Ishii
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Editor information

Editors and Affiliations

  1. Center for Environmental Science, Horn Point Lab., University of Maryland, Cambridge, MD, USA

    J. E. Purcell

  2. Dauphin Island Sea Lab., Dauphin Island, AL, USA

    W. M. Graham

  3. Institute of Animal Ecology, University of Ghent, Belgium

    H. J. Dumont

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© 2001 Springer Science+Business Media Dordrecht

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Watanabe, T., Ishii, H. (2001). In situ estimation of ephyrae liberated from polyps of Aurelia aurita using settling plates in Tokyo Bay, Japan. In: Purcell, J.E., Graham, W.M., Dumont, H.J. (eds) Jellyfish Blooms: Ecological and Societal Importance. Developments in Hydrobiology, vol 155. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0722-1_20

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  • DOI: https://doi.org/10.1007/978-94-010-0722-1_20

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-3835-5

  • Online ISBN: 978-94-010-0722-1

  • eBook Packages: Springer Book Archive

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